Setting this to reCenter(1) forces the modem to recenter its receive Plesiochronous/Doppler buffer, which absorbs timing differences between the transmit and receive clock domains. This buffer naturally drifts toward one end over time on satellite links with Doppler shift or slightly mismatched reference clocks, so recentering it manually prevents an eventual buffer overflow or underflow that would cause a data glitch or brief re-sync. An admin monitoring a slowly-drifting buffer-fill alarm might schedule a periodic cdm570ReCenterBuffer=1 set during a maintenance window to head off an unplanned frame slip.